Pre-Tertiary exposures are known to occur in java at three localities, namely the jiwo Hills and Luk Ulo area in central java and the Ciletuh area, in West Java. The pre-Tertiary rock assemblage in Luk Ulo has been regarded as a melange complex.
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In the Jiwo Hills area Tertiary strata ranging in age from Middle.Eocene lie upon outcropping pre-t~rtiary metamorphic base~ent. A well exposed sequence ranging up to Middle Miocene was studieq and a good stratigraphic subdivision obtained, mainly by utilising the planktonic fo:raminifera. An Eocene sedimentary sequence of late Ta (early-middle …